Influence of Electrode Morphology on Electrochemical Response of SOFC Cathodes
Influence of Electrode Morphology on Electrochemical Response of SOFC Cathodes
复制标题
电极形貌对 SOFC 阴极电化学响应的影响
DOI：
10.1149/1.3495836
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发表时间：
2010
影响因子：
5
通讯作者：
S. Adler
中科院分区：
文献类型：
--
作者：
C. Kreller;M. Drake;S. Adler
通过有限元计算，从理论上研究了混合导电固体氧化物燃料电池(SOFC)阴极中电极微结构对O2还原速率的影响。这些计算被用来预测具有理想三维微结构的单相电极的阻抗和非线性高次谐波响应。这些计算表明，阻抗形状和高次谐波响应通常对电极/电解液界面附近微结构的精确细节非常敏感，即使梯度远远超出界面。相反，使用宏观均质(平均属性)描述可以准确地模拟比界面更远的颗粒直径的微观结构细节。
Using finite element calculations, we have investigated theoretically the role of electrode microstructure on the rate of O2 reduction in mixed conducting solid oxide fuel cell (SOFC) cathodes. These calculations were used to predict both impedance and nonlinear higher order harmonic response of single-phase electrodes having idealized 3-D microstructures based on cylinders necked spheres. These calculations show that impedance shape and higher harmonic response are generally very sensitive to the exact details of the microstructure near the electrode/electrolyte interface, even when gradients extend far beyond the interface. In contrast, microstructural details further than about one particle diameter from the interface can be accurately modeled using a macrohomogeneous (average property) description.